Suppose that an enterprise plans to deploy web applications using HUAWEI CLOUD Stack.

The correct answer is B. BMS . For a typical web application architecture on HUAWEI CLOUD Stack, ECS provides the compute instances, IMS provides reusable images for quick deployment, AS enables elastic scale-out and scale-in based on demand, and ELB distributes traffic and improves availability. Huawei’s ECS and IMS documentation explicitly notes that ECS images can be used with Auto Scaling for dynamic expansion to meet peak demand, which directly supports quick deployment and elasticity.

BMS is a dedicated bare-metal service intended for scenarios needing direct physical hardware access, stronger isolation, or reduced virtualization overhead. It is useful for special workloads, but it is not required for the classic goals listed in the question, especially high cost-effectiveness and fast elastic web scaling. Those goals are more naturally achieved with ECS-based architectures plus ELB and AS. Huawei’s BMS positioning emphasizes physical-server management and performance advantages, not being a necessary part of a standard web application elasticity stack. Therefore, among the listed services, the one that is not required is BMS , making B the verified answer.

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